MIL-F-26301G
TABLE I. Lamp rating.
Source voltage
Load range (amperes)
1.0 to 7.5
28 V dc
1.0 to 5.0
28 V 400 Hz ac
0.25 to 4.0
115 V 400 Hz ac
1.0 to 15.0
28 V ac or dc
3.5.4 Flash characteristics.
3.5.4.1.1 Single output circuits. When flashers are tested as specified in 4.4.2.1.1, the flash rate shall be as
specified (see 3.1).
3.5.4.1.2 Dual output circuits. When flashers are tested as specified in 4.4.2.1.2, the flash rate shall be as
specified (see 3.1).
3.5.4.2 Flash cycle (on-to-off ratio). The "on" time of the flash cycle shall be considered that portion of the cycle
during which the voltage supplied to the lamp load is 90 percent or more of the rated voltage. The "off" time shall be
considered that portion when the voltage supplied to the load is less than 10 percent of rated voltage. The flash cycle
3.5.4.2.1 Single output circuits. When flashers are tested as specified in 4.4.2.2.1, the "on" time shall be 70 ±10
percent of the total cycle.
3.5.4.2.2 Dual output circuits. When flashers are tested as specified in 4.4.2.2.2, the "on" time of one circuit shall
equal the "off" time of the other and vice versa within ±5 percent.
3.5.4.3 Switching time. When flashers are tested as specified in 4.4.2.3, the switching time shall be as specified in
3.5.4.3.1 and 3.5.4.3.2, as applicable.
3.5.4.3.1 DC flashers. The elapsed time for switching the "off" to "on" or "on" to "off" condition shall be not greater
than 0.03 second for dc flashers.
3.5.4.3.2 AC flashers. Zero crossover switching shall be used for initiation and termination of the "on" time of each
cycle. Initiation of the "on" time shall coincide with zero voltage crossover and termination of "on" time shall coincide
with zero current crossover within 20 degrees, respectively.
3.6 Voltage drop. Flashers shall be tested as specified in 4.4.3 and unless otherwise specified (see 3.1), the
voltage drop within the flasher shall not exceed 4.0 percent of the input voltage for any value of load within the
specified limits.
3.7 High and low temperature soak and operation. When tested as specified in 4.4.4, flashers shall operate
satisfactorily when tested under the following conditions.
3.7.1 High temperature. At 71°C (unless otherwise specified) (see 3.1), following the soak period specified in
3.7.2 Low temperature. At -62°C and -54°C, following the soak period specified in 4.4.4.2, flashers shall meet the
requirements of 3.5.4.1, 3.5.4.2, 3.5.4.3, and 3.6, as applicable. There shall be no distortions, cracking, differential
expansion or pliability of nonmetallic parts.
3.8 Vibration. After flashers are tested as specified in 4.4.5, they shall meet the requirements of 3.5.4.1, 3.5.4.2,
3.5.4.3, and 3.6, as applicable.
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